We will remove the ability to post to a user's friends' walls via the Graph API. Specifically, posts against [user_id]/feed where [user_id] is different from the session user, or stream.publish calls where the target_id user is different from the session user, will fail. If you want to allow people to post to their friends' timelines, invoke the feed dialog. Stories that include friends via user mentions tagging or action tagging will show up on the friend’s timeline (assuming the friend approves the tag). For more info, see this blog post.

We are disabling this feature starting in February, if you wish to enable it (only temporarily until February), go to your app dashboard > Settings > Advanced > Disable "February 2013 Breaking Changes"

I highly recommend against doing so, however, since starting February this functionality will cause your app to throw the same error again.

Ah, thanks so much! Do you know how I would go about making a story that includes another user?
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Marche101Dec 12 '12 at 23:04

1

The best way is to invoke the feed dialog with a to parameter in the Bundle with the UID of the friend (that should work). Or, you can post a regular status update with user mentions tagging so that it can show up on the friend's timeline.
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Jesse ChenDec 13 '12 at 0:25

@JesseChen Can you please tell me how to tag the friends using facebookmobile api
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TrinuMar 21 '13 at 9:35